Congratulations to Jack Osbourne for his lifestyle change. What a fantastic accomplishment! Jack credited the ketogenic/low-carb Paleo diet for helping him manage his multiple sclerosis and fueling his recent 70-pound weight loss. Jack's mother, Sharon Osbourne, lost 30 pounds in six weeks by following a ketogenic-style Atkins diet that limited her daily carb intake to about 25 grams. Sharon, 61, has said she has never felt better.